Seismic deformation of the Mw 8.0 Wenchuan earthquake from high-rate GPS observations
Seismic deformation of the Mw 8.0 Wenchuan earthquake from high-rate GPS observations
复制标题
DOI：
10.1016/j.asr.2010.03.006
复制
发表时间：
2010-07-15
影响因子：
2.6
通讯作者：
Liu, J.
中科院分区：
文献类型：
--
作者：
Shi, C.;Lou, Y.;Liu, J.
高速率全球定位系统定位已被认为是一个强大的工具，估计历元的台站位移，这是特别有用的地震学。在这项研究中，站位移在2008年5月12日M-W 8.0汶川地震是来自1-Hz的GPS数据收集在一组站在中国。为了得到更精确的结果，研究了整周模糊度分辨率和台站环境相关效应的影响。水平分量的位置精度优于1 cm，表明GPS可以感知幅度约为2 cm的快速位置振荡。对XANY站的地表位移进行了时空分析，检测并讨论了Rayleigh波和Love波引起的地表位移特征。GPS导出的位移与根据最近发表的破裂模型计算的相关合成数据的比较显示出合理的波形一致性。振幅的各种差异需要进一步研究，也意味着如果同化GPS导出的位移，破裂反演可能会得到改善。(C)2010年Elsevier有限公司代表空间研委会出版。
High-rate GPS positioning has been recognized as a powerful tool in estimating epoch-wise station displacement which is particularly useful for seismology. In this study, station displacements during the 12 May 2008 M-w 8.0 Wenchuan earthquake are derived from the 1-Hz GPS data collected at a set of stations in China. The impacts of integer ambiguity resolution and station environment-dependent effects are investigated in order to yield more accurate results. The position accuracy of horizontal components of better than 1 cm suggests that GPS can sense the rapid position oscillation of about 2 cm in amplitude. Temporal and spatial analysis is applied to the surface displacement at station XANY and the characteristics of the movements due to Rayleigh and Love waves are detected and discussed. The comparison of GPS-derived displacement with relevant synthetic data computed based on a recently published rapture model shows a reasonable agreement in waveform. The various differences in amplitude need further investigation and also imply that rapture inversion might be improved if GPS-derived displacement is assimilated. (C) 2010 Published by Elsevier Ltd. on behalf of COSPAR.